Similarities and differences between thermionic emission and liquid evaporation

Sara walked north at 100 m/s. Han had a different velocity but the same speed. He could have walked. The answer is option D: Han could have walked north at 100 m/s.

Velocity is a vector quantity that includes both speed and direction. In this scenario, Sara walked north at a speed of 100 m/s. Now, for Han to have the same speed but a different velocity, he would also need to be moving at 100 m/s. However, the direction of his movement can vary. Option A states that Han could have walked south at 50 m/s. This would result in a different speed than Sara, so it doesn’t meet the given conditions. Option B suggests that Han could have walked north at 200 m/s. This violates the condition of having the same speed as Sara, as Han’s speed would be twice as fast.

Option C suggests that Han could have walked west at 100 m/s. Again, this violates the condition of having the same speed as Sara, as Han’s direction is different. Option D states that Han could have walked north at 100 m/s. This satisfies the condition of having the same speed as Sara and allows for a different direction of movement, making it the correct option. In summary, only option D, where Han walks north at 100 m/s, meets the requirement of having the same speed as Sara while allowing for a different direction of motion.

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To bring an electron from infinity to the point where the electric potential is zero, an external force must work against the electric field created by the two-point charges q1 and q2. The work done by the external force is equal to the change in the electric potential energy of the electron. In summary, no external work is required.

The electric potential at infinity is defined as zero, so the initial electric potential energy of the electron is also zero. As the electron moves closer to the point where the electric potential is zero, the electric potential energy increases. At the point where the net electric field is zero, the electric potential energy of the electron is maximum.

Therefore, the work done by the external force is equal to the maximum electric potential energy of the electron at the point where the net electric field is zero. This work can be calculated using the equation:

Work = (electron charge) x (maximum electric potential)

Since the charge of an electron is -1.6 x 10^-19 C, and the maximum electric potential is equal to the electric potential at point P, which is zero, the work done by the external force to bring the electron from infinity to point P is zero.

In summary, no external work is required to bring an electron from infinity to the point at which the electric potential is zero, as the maximum electric potential energy of the electron at point P is zero.

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Answer:

KE = 1/2 M V^2

V = (2 KE / M)^1/2 = (2 * 40 / .1)^1/2 = 28.3 m/s

Answer:

i really don't know

Explanation:

Sara pushed a box of lab equipment along the ground, displacing it by 1 meter. she has done work on the box of lab equipment.

When a force is applied and an object is moved over a specified distance, a work has been completed. The following formula is used to calculate an object's work,

W = Fd

Where, F is the applied force, and d is the object's displacement.

Therefore ,Sara has therefore completed her work on the box of lab equipment when she moves it by 1 m.

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The Big Bang is still visible today due to the Cosmic Microwave Background (CMB) radiation, which is a form of electromagnetic radiation left over from the Big Bang.

This radiation was detected in the 1960s by two American astronomers, Arno Penzias and Robert Wilson. Due to its low intensity, the CMB was only detectable with the help of very sensitive radio telescopes.

The CMB radiation has an extremely uniform temperature of about 2.7 degrees above absolute zero, and it has a slight variations in temperature across the sky, which provides evidence of the Big Bang.

These variations are thought to be the seeds of the galaxies and other cosmic structures that form the universe today.

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Explanation:

We know that,

\(v = rw\)

Where, v = tangential velocity (m/sec)

r = radius = 17.67 m

w = angular velocity = 0.83 revs/ sec

v = 14.66 m/sec

Distance in one minute = 879.6 m

= 2885.82 feet

The magnetic flux is 9.12Wb, the magnetic flux, if the surface is horizontal, is 0, the magnetic flux in the area is 19 and angle 54 is 5.08Wb.

(a) The magnetic flux through a flat surface of area 19 cm2 if the surface is vertical can be calculated using the formula

Φ = BA, where Φ is the magnetic flux, B is the magnetic field strength, and A is the area of the surface. In this case, the magnetic flux is

0.48T ×19 cm² = 9.12 Wb.

(b) The magnetic flux through a flat surface of an area 19 cm2, if the surface is horizontal, is 0 Wb. This is because the magnetic field is directed vertically upward, so it will not be able to penetrate through a horizontal surface.

(c) The magnetic flux through a flat surface of area 19 cm2, if the surface is at an angle of 54° with the horizontal, can be calculated using the formula Φ = BAcosθ, where θ is the angle between the magnetic field and the surface. In this case, the magnetic flux is

0.48T ×19 cm²× cos(54°) = 5.08 Wb.

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Answer:

1) Given acceleration due to gravity as 10N/kg

N/kg is the same as m/s². From W=mg

making g subject ... you have g = W/m

where m is in kg and W is in N

hence we have N/kg

So g=10ms-²

Gravitational Potential Energy=mgh

At height 4m

PE=6 x 10 x 4

=240J.

At height 6m

PE=6 x 10 x 6

=360J.

2) KE=1/2mv²

=1/2 x 6 x 5² =75J

When the speed is doubled... it becomes 2x

so V = 2x5=10ms-¹

KE=1/2 x 6 x 10² =300J.

3) KE=1/2mv²

KE is given as 100J

mass=0.5kg

Making V the subject

you have v² =2KE/m

v²=2 x 100/0.5

v²=400

taking square root

v=20ms-¹.

Have a great day✌

Answer:

1.)heat

2)Metals

3)metals

4)poor conductors of electricity

5)attracted

6)magnetic

Answer:

Magnetism is the force exerted by magnets when they attract or repel each other.

Answer:

Magnetic fields are produced by pivoting electric charges, as per Hyper Physics. Electrons all have a property of angular momentum, or turn.

Explanation:

Hope this helps

The conduction band is a set of energy levels above the valence band that electrons can jump into when excited.  electrons, holes, dielectrics, and energy bands are the fundamental concepts related to the semiconductor device's operation.

As electrons move, holes appear to move in the opposite direction, resulting in hole currents.Dielectrics: Dielectrics are insulating materials that can be used in electronic circuits to block current flow. When an electric field is applied to a dielectric, it polarizes, which means it creates a small electric dipole within itself. The amount of polarization in a dielectric is determined by its dielectric constant.Energy bands: The energy bands of a semiconductor are divided into two categories: the valence band and the conduction band. In the valence band, electrons are held tightly to their atoms and cannot move freely.

The conduction band is a set of energy levels above the valence band that electrons can jump into when excited. Electrons can flow and current can pass through the material if enough energy is applied to an electron in the valence band to move it into the conduction band. Electrons and holes are two types of charges carriers in semiconductors. Electrons are negatively charged particles found in atoms. They can move around freely within the material's structure in solid-state electronics applications. A moving charge constitutes a current, so electrons make it possible to have current in electrical conductors.

Holes, on the other hand, are not physical objects but rather a lack of electrons. Holes are created in the crystalline structure of a semiconductor when an electron is excited from the valence band to the conduction band. As electrons move, holes appear to move in the opposite direction, resulting in hole currents.

The conduction band is a set of energy levels above the valence band that electrons can jump into when excited. Electrons can flow and current can pass through the material if enough energy is applied to an electron in the valence band to move it into the conduction band.

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The plane flies at speed of 160m/s should drop the package when it reaches at a distance of 824m.

A dropped object travels quickly in the direction of the earth's center. Newton's second law states that the net force applied on an object determines its acceleration. If air resistance is small, the gravitational force, which is also known as an object's weight (w), acts as the net force on any falling object.

Free-fall acceleration seems to be another name for gravitational acceleration. Gravitational fields established by masses pull other masses approach them.

\(h = ut + 1/2 gt^2 ; u=0130 = 1/2 \times 9.8 \times t^2t= 5.15sec\)

The packet travel with the time period of 5.15sec

The distance = v x t

                      160m/s x 5.15s = 824m

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Answer:

V = 220 [V]

Explanation:

In order to solve this problem we simply need to replace the given values of current and resistance in the expressions proposed.

R = 22 [kΩ] = 22000 [Ω]

I = 10 [mA] = 0.01 [A]

Voltage (V)

\(V = 0.01*22000\\V = 220 [V]\\\)

The pH of the given solution is 6.64. The pH value  of the solution can be determined by using the formula; pOH = -log[OH-].

Explanation: The pH of a solution is defined as the negative logarithm of the concentration of hydronium ions (H3O+). It is expressed on a scale of 0-14, with 7 indicating neutrality, values below 7 being acidic, and values above 7 being basic. The pH can be calculated using the concentration of hydroxide ions (OH-) present in the solution. The hydroxide ions are 4.33 × 10−8m in concentration.In this case, the pOH value is calculated first, as it is easier to calculate than the pH.  

We can rearrange this formula to obtain pH value of the solution .pOH = -log[OH-].

Let's put the given value in the formula ;pOH = -log[4.33 × 10−8]pOH = -(-7.36)pOH = 7.36pH + pOH = 14

Now, let's plug the calculated value of pOH in the above equation to find out pH;pH + 7.36 = 14pH = 14 - 7.36pH = 6.64

The pH of the given solution is 6.64.

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Answer:So the lamp post is giving energy to the town and the kid is using mecanical energy to ride his skateboard

Explanation:

The work function for barium is 2.48eV. If light of 400nm is shined on the barium cathode, the maximum velocity of the ejected electron is 4.54 × 105 m/s.

Energy can be transferred from electromagnetic radiation to matter in the form of photons. The energy of each photon is equal to the product of Planck's constant (h) and the frequency of radiation (ν), which is related to the wavelength (λ) by the equation c = νλ, where c is the speed of light in vacuum. Because of the photoelectric effect, which is a quantum effect in which electrons are ejected from matter when exposed to radiation with sufficiently high frequency, this energy can ionize atoms or eject electrons from metal surfaces.

The maximum kinetic energy that an electron can acquire in the photoelectric effect is equal to the energy of the incident photon minus the work function of the metal. If the metal is irradiated with monochromatic radiation, the maximum kinetic energy of the photoelectron can be calculated using the equation KEmax = hν – φ, where KEmax is the maximum kinetic energy of the ejected electron, h is Planck's constant, and φ is the work function of the metal.Barium has a work function of 2.48 eV, and radiation with a wavelength of 400 nm has a photon energy of 3.1 eV. If the photon is absorbed by a barium atom, the maximum kinetic energy of the ejected electron is:KEmax = hν – φ = hc/λ – φ = 3.1 eV – 2.48 eV = 0.62 eV.To convert this to velocity, the kinetic energy must first be converted to joules, and then to velocity using the following equation:KE = ½ mv2 ⇒ v = √(2KE/m),where m is the mass of the electron, which is 9.11 × 10–31 kg.Therefore,v = √[2(0.62 × 1.6 × 10–19)/9.11 × 10–31] = 4.54 × 105 m/s.So, the maximum velocity of the ejected electron is 4.54 × 105 m/s.

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The distance to open fire, based on the given parameters, is approximately 267 meters.

What is distance?

Distance is a scalar quantity that refers to the extent of space between two points or objects. It is a measurement of how far apart two locations or objects are from each other.

To calculate the distance at which the enemy's eyes are just resolvable by your pupil, we can use the concept of angular resolution. The formula for angular resolution is:

θ = 1.22 * (λ / D)

In this case, the diameter of the target's eye (s) is given as 2.5 cm, which is equivalent to 0.025 m. The diameter of the pupil (D) is given as 4.9 mm, which is equivalent to 0.0049 m. The wavelength of light (λ) is given as 555 nm, which is equivalent to 555 × 10⁻⁹ m.

Substituting these values into the formula, we can solve for the angular resolution (θ). Once we have the angular resolution, we can use basic trigonometry to calculate the distance (d) at which the target is located:

d = (s / 2) / tan(θ)

By plugging in the values, we find that the distance at which the target is when you open fire is approximately 267 meters.

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Answer:

false

Explanation:

To solve this problem, we can use the principle of conservation of momentum. Since there is no external force acting on the system (player + puck), the total momentum before the collision is equal to the total momentum after the collision.

Let's define the positive direction as the direction in which the puck is moving after the collision. Then, we can write:

\(mplayer * vplayer + mpuck * 0 = (mplayer + mpuck) * vf\)

where mplayer and mpuck are the masses of the player and the puck, vplayer is the initial velocity of the player (which is zero), and vf is the final velocity of the combined system after the collision.
Solving for vf, we get:

\(vf = (mplayer * vplayer) / (mplayer + mpuck)\)
Plugging in the given values, we get:

\(vf = (93.0 kg * 0 m/s + 0.150 kg * 42.5 m/s) / (93.0 kg + 0.150 kg) = 0.256\) m/s

Now, we can use the fact that the player recoils in the opposite direction with the same momentum as the puck. Therefore:

\(mplayer * (-vplayer) = mpuck * vf\)
Solving for vplayer, we get:
vplaye\(r = (-mpuck * vf) / mplayer\)
Plugging in the values, we get:
vplayer =\((-0.150 kg * 0.256 m/s) / 93.0 kg = -0.00041 m/s\)(negative sign indicates the opposite direction)
Finally, we can use the formula for displacement:
\(d = vplayer * t\)
where t is the time it takes for the puck to travel 16.0 m.

Since the ice is frictionless, the only force acting on the puck is the initial force from the player. Therefore, we can use the formula for constant acceleration:

d = 0.5 * a * t^2

where a is the acceleration of the puck, which is equal to the force applied by the player divided by the mass of the puck: \(a = F / mpuck = (mplayer * vplayer) / (mpuck * t * mpuck) = -vplayer / t\)

Plugging in the values, we get:

\(d = 0.5 * (-vplayer / t) * t^2 = -0.000205 m\)

Therefore, the player recoils \(0.000205\) m in the opposite direction.

Note: the assumption of a frictionless ice is not very realistic, since there is always some friction between the ice and the player's skates. In reality, the player would recoil less than what we calculated here.

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Answer:

Wave Speed (m/s)

31.25

Summary

Wavelength (m)6.25

Frequency (hz)5

Explanation:

https://calculator.academy/wave-speed-calculator/#f1p1

In the sequence of steps in which a black hole is formed, a supernova occurs during the first two steps this statement is false.

Even light cannot escape from a black hole because of its intense gravitational pull. Gravity is quite strong because there is so much packed into a small space. This could happen when a star is dying. Since light cannot escape black holes, they are invisible to humans.

In the initial phase of the inspiral, two black holes orbit one another and slowly approach. The second black hole is created when the two black holes combine and deform. The black hole eventually takes on its definitive shape.

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Given that,

The mass of marble A, m₁=0.08 kg

The mass of marble B, m₂=0.05 kg

The initial velocity of marble A, u₁=0.5 m/s

As the marble B was at rest, the initial velocity of marble B is u₂=0 m/s

The final velocity of marble A, v₁=-0.1 m/s

Let the final velocity of marble B be v₂.

According to the law of conservation of momentum, the total momentum before the collision is equal to the total after the collision.

Therefore

On rearranging the above equation,

On substituting the known values in the above equation,

Therefore the

Answer:

See below

Explanation:

Use conservation of momentum (rather than Kinetic Energy ) for collision problems:

Momentum A  = mv = .08 * .5 = .04  km m/s

Momentum B = mv  = 0

    Total Momentum = .04 + 0 = .04  kg m/s

After collision the sum must be the same

A = mv = .08 ( -.1 ) = - .008 kg m/s

B = m vb   = .05 vb

    .04   =  - .008   +  .05 vb

      vb =  + .96 m/s      in the same direction as original A direction

Answer:

Speed

Explanation:

You can't calculate an object's acceleration without velocity, and it isn't velocity because it has no given direction... therefore, the answer is speed.

The statement "prominences hanging off the limb of the sun are the same as filaments seen in front of the disk" is True.

Prominences and filaments are essentially the same solar feature observed from different perspectives. When viewed from Earth, they appear as dark, thread-like structures called filaments against the bright solar disk.

However, when observed from the edge or limb of the Sun during a solar eclipse or with specialized telescopes, they are seen as bright, arching structures called prominences extending outward from the Sun's surface.

Prominences and filaments are both composed of cooler plasma suspended in the Sun's hot and highly ionized outer atmosphere, known as the corona. They are formed by complex magnetic field interactions and can extend for thousands of kilometers above the Sun's surface.

Prominences/filaments can be stable, lasting for days or even weeks, or they can become unstable and erupt, releasing a significant amount of plasma and energy into space in what is known as a solar eruption or coronal mass ejection.

In conclusion, while their appearance may differ depending on the observer's perspective, prominences hanging off the limb of the Sun are indeed the same as the filaments seen in front of the solar disk.

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Answer:

There are two main ways to determine the age of a rock, these are Relative dating and Absolute dating. Relative dating is used to determine the relative order of past events by comparing the age of one object to another.

Explanation:

Explanation:

rock and fossils are made by layers of dirt, sand,organic matter that has beem compressed over thousands,if not millions of years.

some scientists use this layering to determine how old the earth is.

its kind of like looking at the rings of a tree to see how old it is.

the scientists look at each layer of the rock or fossil and use what they already know about when this type of soil or organic matter existed and try to piece together the past

Answer:

The atoms ,molecules, or compound present at the start of a chemical reaction that parcitipate in the reaction are the reactants.

Explanation:

The chemical reaction is the way in which one substance reacts against another. So, a chemical reaction consists of the transformation of some substances into others, that is, the process of arranging atoms and bonds when chemical substances come into contact.

In a chemical reaction, the initial substances are called reactants, while the new substances obtained are called products.

So, the atoms ,molecules, or compound present at the start of a chemical reaction that parcitipate in the reaction are the reactants.

Light oil is poured onto the liquid surface until the top surface of the oil coincides with the top is 7.73 mm.

Calculation:-

s = 12 mm

Pw = 835 kg/m3

Pl = 1296 kg/m3

According to Archimedes principle

Pw s^3 g = Pl h s^2 g

h = s [Pw / Pl]

= 12 mm [835 / 1296]

= 7.73 mm

We assume that the top of the cube is still above the oil's surface. If ha is the width of the oil layer, we have that the buoyant force is

B = (Po s^2 ha + Pl s^2 hw ) g

Once again, the buoyant force must be equal to the weight of the cube.

Archimedes' precept (also spelled Archimedes' principle) states that the upward buoyant pressure that is exerted on a body immersed in a fluid, whether or not absolutely or partially, is equal to the weight of the fluid that the frame displaces. Archimedes' principle is a law of physics essential to fluid mechanics. It turned into formulated by way of Archimedes of Syracuse.

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